Precision Gear Metering Pump Provides Scented Plastic Bag Manufacturer Accurate and Consistent Continuous Pulse-Free Process

Pump buy return on investment can be measured in days
By Mike Libbey, Area Sales Manager CIRCOR and Bob Limper, Business Development Manager CIRCOR
A global producer of scented plastic garbage luggage was on the lookout for a substitute for using pre-scented plastic pellets. A serendipitous encounter at a tradeshow led them to a precision gear metering pump resolution that gave them accuracy and consistency on the low move charges required, whereas additionally lowering their costs and improving worker health. Yearly savings are so high that the return on investment for the pump system can be measured in days.
Seeking an alternative for costly pre-scented plastic pellets
A global producer of scented plastic garbage luggage was looking for an alternative to the utilization of pre-scented plastic pellets, which required a dedicated silo for every of the 20 out there fragrances. The pellets are pneumatically conveyed to every silo from either tanker trucks or rail automobiles and the manufacturer was experiencing logistical issues associated with maintaining the silos crammed. They additionally had to carry high costs for sustaining the inventory of the pre-scented pellets.
In addition, the heavily concentrated scents had been causing well being considerations for the workers who complained of headaches. To mitigate this concern, every extruder line was fitted with a vacuum exhaust hood to expel the fumes to the outdoors. On occasion, these emissions led to complaints from neighbors and citations from the United States Environmental Protection Agency.
The company was looking for a means to use plain plastic pellets and apply scented oil on to the plastic sheet instantly after the extrusion process to reduce costs, logistical challenges, and vitality use. They had tried to construct such a system in-house however had struggled to attain accuracy and consistency on the low flow charges they required. They determined to seek a pump-based answer that would directly spray perfume on the nice and cozy melted sheet plastic as a result of the in-house solution could not meet rigorous quality control standards requiring the spray-on scent to exactly match that of pre-scented pellets.
Finding an answer on a tradeshow flooring
Design engineers from the plastic bag producer attending the PackExpo show observed a working demonstration of precision gear metering pumps made by Zenith and asked application consultants if the pumps may be a fit with their application. After collecting information on the application, an area supervisor for the pump producer with extensive expertise in dosing and blending systems visited the plant to get a firsthand view of present operations and collect further info.
Working with the pump manufacturer’s design group they developed a system solution using a Zenith B-9000 Series rotary positive displacement pump particularly designed for single stream chemical responsibility purposes. The pump options an correct, repeatable, pulse free flow in a compact design perfect for dosing additives corresponding to colors, flavors, and fragrances.
This sort of pump is outlined as rotary as a end result of the drive shaft is rotated as in comparison with different kinds of pumps using a reciprocating movement and can also be thought-about to be a positive displacement kind as a result of the displaced quantity is constant and doesn’t range.
Pumping action is achieved by filling the gear tooth spaces and transporting the fluid across the outer diameter of the gears. When the gear teeth mesh, the fluid is displaced and forced to the outlet facet of the pump. The flow fee can solely be adjusted by increasing or reducing the velocity at which the shaft is rotated. The pump selected provides precision grinding and lapping processes that end in a precision metering instrument, producing precise, pulse-less, and repeatable fluid flow.
The pumps offer extremely tight operating clearances to minimize fluid slip. Manufacturing tolerances on many parts are to +/- 50 millionths of inch with surface finishes as clean as four micro inches or better. The pumps are offered with an AC “closed loop” motor velocity controller to maintain up 0.1 percent pump speed accuracy.
The Zenith 9000 series pump is on the market in eleven sizes with capacities ranging from .003 to 300 GPH. Wetted components can be found in via hardened 440C sequence stainless steel, specialty treated 316 stainless-steel, and high quality tool steels corresponding to D2, M2, M4 and CPM-M4 to provide good corrosion and abrasion resistance.
The bag manufacturer selected a model with a magnetic drive (mag-drive) sealing choice, which can eliminate shaft leakage of fluids, increasing plant security and lowering volatile organic compound emissions. The use of a magnetic coupling also eliminates downtime due to mechanical seal failures and eliminates the need for buffer fluids.
เกจวัดแรงดันไทวัสดุ reduces costs and offers uniform fragrance distribution
The new Zenith pump system gave the scented bag manufacturer a steady, pulse free process, which ensures equal and uniform perfume distribution. By adding the scent on to the luggage after leaving the extruder, the plastic bag manufacturer not only eradicated the want to have separate pellet silos for each scent, but additionally eliminated the necessity to vent the fumes that come from the pellets as they journey from the silos to the extruders.
The manufacturer bought the primary system and after profitable trials, ordered six extra methods. Over the past two years they have purchased more than 30 systems, with plans to order more. The manufacturer can additionally be interested in having Zenith conduct annual area calibrations of every system.
After two years of operation, the producer estimates a yearly financial savings of approximately $480,000 per skid in operation. With 30 skids now operating, the return on investment for each system purchase may be measured in weeks. To date, there have been no odor complaints for the reason that buyer installed the Zenith techniques

Scroll to Top